Added handling of static class fields

tests/t00003/t00003.cc

@@ -1,3 +1,5 @@
+#include <functional>
+
 namespace clanguml {
 namespace t00003 {
 
@@ -11,20 +13,28 @@ public:
     void basic_method() {}
     static int static_method() { return 0; }
     void const_method() const {}
+    auto auto_method() { return 1; }
 
     int public_member;
+    static int static_int;
+    static const int static_const_int = 1;
 
 protected:
     void protected_method() {}
 
     int protected_member;
 
+    std::function<bool(const int)> compare = [this](const int v) {
+        return private_member > v;
+    };
+
 private:
     void private_method() {}
 
     int private_member;
-
     int a, b, c;
 };
+
+int A::static_int = 1;
 }
 }